Market street looking East at the Ferry building. There is a move to take cars off Market street.on Thursday , May 8, 2008 in San Francisco, Calif Photo By Kurt Rogers / San Francisco Chronicle

Photo: Kurt Rogers, SFC

Market street looking East at the Ferry building. There is a move...

Image 2 of 4

Cyclists biking along Market Street at Grant Ave. in San Francisco, Calif., on Monday, May 9, 2008. Photo by Liz Hafalia / San Francisco Chronicle

Photo: Liz Hafalia, SFC

Cyclists biking along Market Street at Grant Ave. in San...

Image 3 of 4

Market street looking East at the Ferry building. There is a move to take cars off Market street.on Thursday , May 8, 2008 in San Francisco, Calif Photo By Kurt Rogers / San Francisco Chronicle

Photo: Kurt Rogers, SFC

Market street looking East at the Ferry building. There is a move...

Image 4 of 4

mayorsrace03_079_df.jpg
The San Francisco mayor's race officially kicked off today as Supervisor Chris Daly throws a day long progressive convention in the Tenderloin. Deanne Fitzmaurice / The Chronicle Mandatory credit for photographer and San Francisco Chronicle. No Sales/Magazines out.

San Francisco's Market Street from the Embarcadero to Hayes Valley would permanently close to all traffic except for city mass transit vehicles under a proposal announced at City Hall on Tuesday night.

Supervisor Chris Daly asked the city attorney to draft legislation to permanently ban cars on Market Street between Octavia Boulevard and the Embarcadero, an idea that has been floated by various city leaders, including former Mayor Willie Brown, for more than a decade.

Daly said discussion of a proposal by Mayor Gavin Newsom to close portions of city streets, including a large stretch of the Embarcadero, on two Sundays this year prompted his action.

Closing the 2.3-mile portion of Market Street would open the often-congested roadway to pedestrians and cyclists, though Daly said there would still need to be places where cars and other vehicles could cross.

He said the traffic that now relies on that roadway could shift to Mission, Howard and Folsom streets to the south.

In addition to this proposal, the Municipal Railway is currently considering a plan to make major improvements to transit on Market Street and throughout the city. Another idea that has been floated would redesign stretches of the street to create distinct bicycle lanes.

Brown's vision of banning private automobiles on Market Street faced strong opposition from the business community and never materialized. Daly's proposal will face multiple hurdles at City Hall, including approval from the full board and Newsom, before it can be enacted.